New Mercedes AMG A45 S 2021 Review Interior Exterior.

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The AMG developers extensively reinforced the bodyshell, as it provides the basis for the precise self-steering characteristics, as well as track and camber stability, also when driving at high speed. A lightweight aluminum plate bolted underneath the engine - the "shearing plate" - increases the torsional rigidity at the vehicle's front end. This is supplemented by a strut tower brace between the front suspension struts and pistol-shaped "shotguns" ‑ these are additional reinforcing plates connecting the side members to the A-pillars to minimize movements of the front section. Diagonal struts at the front and rear of the underbody further improve rigidity. As a result, the entire suspension system responds highly precisely even at the physical limits, giving the driver clearly defined feedback – with considerably reduced body torsion around the longitudinal and transverse axis, and less rolling and pitching on bends, when braking and during load cycles.

With an output of up to 310 kW (421 hp), the completely newly developed 2.0-liter engine is the world's most powerful turbocharged four-cylinder manufactured for series production. Mercedes-AMG has bettered the output of the preceding engine by 30 kW(40 hp). Maximum torque has also increased from 475 to up to 500-newton meters. With an output per liter of up to 155 kW (211 hp), the new Mercedes-AMG high-performance turbo engine even ranks ahead of many well-known super-sports car engines. The new, highly efficient powerpack is produced on an innovative production line in Affalterbach, on the "One Man, One Engine" principle.

In the 45 models, the four-cylinder ensures extremely agile performance in two output classes: with 310 kW (421 hp) as the S-model and with 285 kW (387 hp) in the basic version.

This positioning logic has already proved successful for the AMG Performance models with a V8 engine and meets individual customer wishes even better. The new compact sportscars absolve the sprint from zero to 100 km/h in record time: the A 45 S 4MATIC+ requires only 3.9 seconds (CLA 45 S 4MATIC+: 4.0 seconds), while the basic A 45 4MATIC+ model absolves this discipline in 4.0 seconds (CLA 45 4 MATIC+ in 4.1 seconds). The top speed of the basic models is electronically limited to 250 km/h, while the S-models are capable of up to 270 km/h ex-factory. With the optional AMG Driver‘s Package, the top speed can also be increased to 270 km/h for the basic variants.

Apart from its performance figures, the new engine impresses with its immediate response. To this end, the torque curve was carefully balanced ("torque shaping"): The maximum torque of 500 Nm (480 Nm in the basic variants) is available within a range of 5000-5250 rpm (4750-5000 rpm in the basic variants). With this configuration, the AMG engineers have achieved a power delivery akin to a naturally aspirated engine. The engine developers were able to realize a dynamically increasing torque curve in the lower engine speed range, thereby improving throttle response. The increasing torque at higher rpm makes the engine more free-revving. Moreover, the high maximum engine speed (up to 7200 rpm) emphasizes the engine's sporty character.

The new engine excels with numerous intelligent design features. Unlike the likewise transversely installed four-cylinder in the 35 models or the preceding model, the new engine is rotated around its vertical axis by 180 degrees. This means that the turbocharger and the exhaust manifold are now positioned at the rear, on the side of the firewall when viewed from behind. The intake system is therefore positioned at the front. This configuration allows the flattest possible and aerodynamically advantageous front section design. Furthermore, the new arrangement allows much-improved air ducting with shorter distances and fewer diversions - both on the intake and exhaust side.

Thanks to its good thermal conductivity, the water-cooled mold allows rapid cooling and solidification of the melt. The result is a fine-grained, dense structure that guarantees very high strength. Complex interior geometries can be realized with the help of enclosed sand cores.

The so-called closed-deck construction – a design taken from motorsport ‑ ensures maximum rigidity with low weight and allows peak combustion pressures of up to 160 bar. The areas around the cylinders are mostly solid, and the cover plate is only penetrated by smaller ducts for the coolant and engine oil.

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